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Page 2 of 4 <br /> I <br /> From: Tim Cuellar [mailto:tcuellar@advcleoenv.com] <br /> Sent: Wednesday, March 20, 2013 9: 18 AM <br /> To: Vicki McCartney [EH] <br /> Cc: rmar[v@advgeoenv.com <br /> Subject: RE: 1045 West Charter Way <br /> Hi Vicki, <br /> I will revise and resubmit report today. <br /> I don't believe the influent DPE-water samples that have been collected to date are a reflection of <br /> existing ground water conditions at the site. Based on my experience with DPE systems, a better <br /> way to gauge the influent water concentrations is to collect a grab sample utilizing a bailer from <br /> each `active' well location and to composite samples in the lab. The current DPE influent sample <br /> port is located after the DPE central mixing chamber (knockout), and after the process pump. <br /> While the water/soil-vapor are being extracted, the high DPE vacuum causes the dissolved portion <br /> of what is being extracted to volatilize. I typically see an 90-95% reduction in the dissolved or <br /> groundwater portion during the DPE process. <br /> Previous DPE remediation samples have been collected from the dedicated influent sampling port <br /> located after the mixing chamber/process pump. So we believe what we are seeing in groundwater <br /> at the mixing chamber is the result of 90-95% remediation. However, what we need to evaluate is <br /> the ` actual' progress of ground water concentrations prior to remediation; which would reflect <br /> current groundwater conditions. So we would like to recommend collecting a grab sample from <br /> each active well locations, and composite the sample in the laboratory. <br /> Thanks - Tim <br /> Timothy J. Cuellar <br /> Senior Project Geologist <br /> Advanced GeoEnvironmental, Inc. <br /> Stockton • Santa Rosa e Monterey • Brea • Spokane • Reno • Dallas <br /> 1 -800-511 -9300 <br /> tcuel lar@advgeoenv. com <br /> www.advgeoenv. com <br /> This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any <br /> unauthorized review, use, disclosure or distribution of this emaillfax is prohibited. If you are not the intended recipient, please contact <br /> the sender by email/fax and destroy all paper and electronic copies of the original message. <br /> From : Vicki McCartney [EH] [mailto:vmccartnev(cbsicehd.com] <br /> Sent: Wednesday, March 20, 2013 8:27 AM <br /> To: tcuellar@advaeoenv.com <br /> Subject: RE: 1045 West Charter Way <br /> Tim, <br /> There are several revisions that need to be made to the second quarter 2012 report for the site at 1045 <br /> West Charter Way in Stockton, California. <br /> 3/21/2013 <br />